JP2004074327A - Method for grinding in vertical type double-disc surface grinding machine - Google Patents

Method for grinding in vertical type double-disc surface grinding machine Download PDF

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Publication number
JP2004074327A
JP2004074327A JP2002235684A JP2002235684A JP2004074327A JP 2004074327 A JP2004074327 A JP 2004074327A JP 2002235684 A JP2002235684 A JP 2002235684A JP 2002235684 A JP2002235684 A JP 2002235684A JP 2004074327 A JP2004074327 A JP 2004074327A
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grinding
work
workpiece
vertical
grindstone
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JP3806680B2 (en
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Akiyoshi Saito
斉藤 明善
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Daisho Seiki Corp
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Daisho Seiki Corp
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Priority to US11/072,970 priority patent/US7004816B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10Single-purpose machines or devices
    • B24B7/16Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for grinding in a vertical type double-disc surface grinding machine which efficiently feeds a grinding wheel for grinding in accordance with pre-processing precision in each workpiece even when there is large irregularity in pre-processing precision. <P>SOLUTION: An upper and a lower grinding wheels 2 and 3 are moved from a stand-by position to a grinding end position at a grinding position A1 for simultaneously grinding an upper and a lower flat surfaces of the workpiece in this method. By a pre-processing measuring device 13 disposed close to a workpiece attaching/detaching position A1, vertical positions of the upper and the lower flat surfaces of the workpiece W before grinding are measured, and the stand-by positions of the grinding wheels 2 and 3 are set based on measurements. The workpiece W is moved to a grinding position A2, and the grinding wheels 2 and 3 are moved at high feed speed from the above-mentioned set stand-by positions to a grinding start position where they get in contact with the workpiece or a position before they get in contact. Grinding is then conducted at grinding speed lower than the feed speed. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本願発明は、ワーク保持治具に保持されたワークの上下の被研削面を、上下方向移動可能な上下1対の砥石により同時に研削する竪型両頭平面研削盤の研削方法に関する。
【0002】
【従来の技術】
竪型両頭平面研削盤における定量研削の一例として、本件出願人は、砥石回転用モータの電流値を測定し、該電流値の変化により砥石の研削開始位置を設定する方法を開発している。すなわち、砥石回転用モータの電流値を測定しながら砥石をワークに接近させ、ワークに接触後、電流値増加分が設定値に達すると、該位置を研削開始位置としてコントローラ等に記憶し、砥石を一旦待機位置まで後退させる。上下の砥石が共に研削開始位置を検出して後退した後、再度両砥石を上記研削開始位置の直前まで高速で送り込み、次いで研削速度に減速し、研削開始位置から所定取代の研削を行なっている。
【0003】
【発明が解決しようとする課題】
上記研削方法でワークの上下両被研削面を研削する場合、ワークの前加工精度、すわなち、研削前の振れ、厚み及び高さ等を把握していない状態で研削開始位置の検出を行なうので、砥石の待機位置(後退位置)は、ワークの各種異形等を考慮してワークから大きく離れた位置に設定しなければならず、したがって、砥石の送り量(アプローチ量)が無駄に長くなり、作業能率の低下の原因となっている。
【0004】
【発明の目的】
本願発明は、前加工精度に大きなばらつきがあっても、研削前にワークを測定しておくことにより、各ワークの前加工精度に応じて、効率的に砥石を送り込み、研削できる竪型両頭平面研削盤の研削方法を提供することである。
【0005】
【課題を解決するための手段】
本願請求項1記載の発明は、上下に対向すると共に上下方向移動可能な1対の回転砥石と、ワーク保持治具を有するワーク移動用の移動テーブルとを備え、移動テーブルによりワークを研削位置とワーク着脱位置とに位置変更可能とし、研削位置において、両砥石をワークの上下被研削面からそれぞれ上下に離れた待機位置から、研削終端位置まで移動することにより、ワークの上下被研削面を同時に平面研削する竪型両頭平面研削盤において、
ワーク着脱位置の近傍に配置された前加工測定器により、研削前のワークの上下被研削面の上下方向位置を測定すると共に、上記測定値に基づいて砥石の待機位置を設定し、
ワークを研削位置に移動し、砥石を上記設定された待機位置からワークに接触する研削開始位置または接触手前の位置まで高速の送り速度で移動し、
その後、上記送り速度より低速の研削速度で研削することを特徴とする竪型両頭平面研削盤における研削方法である。
【0006】
【発明の実施の形態】
図1は本願発明を適用した竪型両頭平面研削盤の側面図であり、本体ケース1内に上下に対向する1対の環状形の砥石2,3を収納しており、上下の砥石2,3は、同一の垂直軸芯O3上に配置された上下の砥石軸4,5にそれぞれ固着されている。両砥石軸4,5はそれぞれ昇降機構により上下方向移動可能に構成されると共に、互いに逆方向に回転するように動力伝達機構に連動連結している。
【0007】
ワーク移動用の回転テーブル6は垂直なテーブル駆動軸7の上端に固着され、該テーブル駆動軸7は円筒形の支持ケース8に軸受を介してテーブル回転軸心O1回り回転可能に支持されると共に図示しない伝動機構を介して駆動モータに連動連結している。
【0008】
回転テーブル6上には、1対のワーク保持治具10と、各ワーク保持治具10上のワークWを上方から固定するクランプ装置12を備え、回転テーブル6の近傍位置には研削前のワーク寸法を測定する前加工寸法測定器13が配置されている。
【0009】
両ワーク保持治具10は、テーブル軸芯O1回りに180°の位相差で配置されると共に、円筒形の治具支持ケース15に自転軸芯O2回り回転駆動可能に支持されており、回転テーブル6が半回転することにより、砥石側の研削位置A2と、反対側の着脱位置A1の間で位置変更できるようになっている。
【0010】
クランプ装置12は、下方へ伸長可能なクランプロッド21を有する1対のシリンダ22と、各クランプロッド21の下端部に装着された押付ユニット23から構成されている。各シリンダ22は、それぞれワーク保持治具10の自転軸芯O2と同一軸芯上に配置されると共に、回転テーブル6の上面に固定されたブラケット24に固定され、回転テーブル6の回転によりワーク保持治具10と共にテーブル回転軸芯O1周りに回転するようになっている。
【0011】
図2は着脱位置A1におけるワーク保持治具10及び測定器13の拡大側面図である。縦断面で示すワークWは、内側ディスク部26と、該内側ディスク部26と筒部を介して一体成形された外側フランジ部27を有しており、該外側フランジ部27の上下両端面が、被研削面として同時に平面研削される。
【0012】
クランプ装置12の押付ユニット23は、下端部に回転可能な鋼球25を備えており、該鋼球25によりワークWの中心孔の周縁を押え付け、保持治具10及びワークWの自転軸芯O2回りの回転を許すようになっている。
【0013】
寸法測定器13は回転テーブル6のワーク着脱位置A1の近傍に配置されており、上下1対のてこ形測定子30を備えた差動トランス式電気マイクロメータである。各測定子30のアーム部31は各測定ヘッド32に上下方向回動可能に支持され、上側のアーム部31は板ばね等の付勢手段により下方に付勢され、下側のアーム部31は板ばね等の付勢手段により上方に付勢されている。測定器本体33内又は測定ヘッド32内には各測定子用の差動トランスが内蔵されており、各測定子30の上下方向の変位を電流等の電気的量に変換し、アンプ等を介してデジタルあるいは指針方式で制御盤35の表示面に表示するようになっている。また、各測定ヘッド32内には、各測定子30を付勢手段に抗して上方及び下方に強制的に広げることができるリトラクタ機構(シリンダ装置等)が備えられている。
【0014】
上下の測定ヘッド32は、それぞれ上下方向スライド調節可能に測定器本体33に支持されており、上側測定子調節ねじ37及び下側測定子調節ねじ38により、各測定ヘッド32の上下方向位置をそれぞれ調節できるようになっている。
【0015】
測定器本体33は前後スライダ39に搭載され、該前後スライダ39は、垂直な支持プレート40に設けられた上下1対の水平なレール41に前後方向移動可能に支持されると共に、前後用油圧シリンダ42のロッドに連結され、該油圧シリンダ42の伸縮により前後に移動するようになっている。
【0016】
【研削方法】
まず、図3のように、研削されるワーク寸法(厚み)の基準となるマスターゲージMGを用いて、前加工寸法測定器13の0値調整を行ない、調整後の寸法測定器13により、図4のように研削前のワーク寸法を着脱位置A1で測定し、該測定値に基づいて、図5のように研削位置A2において、所定取り代の研削を行なう。以下、各工程毎に詳しく説明する。
【0017】
[測定器の0調整]
(1)図3において、研削されるワーク寸法(厚み)の基準となるマスターゲージMGをワーク保持治具10の上面に載せ、クランプ装置12の押付ユニット23により、マスターゲージMGの中央孔の周縁を上方から押え付け、マスターゲージMGを所定位置に位置決め固定する。
【0018】
(2)上下の測定子30をリトラクト機構で上下に広げた状態として、前後用油圧シリンダ42により測定器本体33を前進させ、仮想線のような前進位置でリトラクト機構を解除することにより上下の測定子30の間隔を狭め、両測定子30をマスターゲージMGの外周側フランジ部27上下端面に接触させる。
【0019】
(3)測定電流値を制御盤35の表示面(モニター)に表示させ、まず上側測定子用調整ねじ37により上側測定ヘッド32を上下方向にスライドさせ、上面位置表示値が”0”になるように調整し、次に下側測定子用調整ねじ38により下側測定ヘッド32を上下方向にスライドさせ、下面位置の表示値が”0”になるように調整する。
【0020】
(4)測定アーム部31の上下のリトラクションを繰り返し、表示値が大きく変化しないのを確認する。確認後、リトラクタにより測定子30を上下に広げた状態で後退させ、また、クランプ装置12によるクランプを解除し、ワーク保持治具10上からマスターゲージMGを外す。
【0021】
[前加工状態のワークの測定]
(1)図2において、図示しないローディング装置により未研削(前加工状態)のワークWを、ワーク着脱位置A1のワーク保持治具10上に載せ、クランプ装置12の押付ユニット23により、ワークWの中央孔の周縁を押し付け、位置決め固定する。
【0022】
(2)上記のようにワークWをワーク保持治具10に位置決め固定した後、測定器13により、ワークWをゆっくりと自転させながらフランジ部27の上下両端面の上下方向位置を測定する。
【0023】
すなわち、測定子30を上下方向に開いた状態で測定器本体33を前進させ、ゆっくりと回転するワークWに対して、上側の測定子30を下降すると同時に下側の測定子30を上昇させ、未研削ワークWの上下被研削面の上下方向位置を測定する。
【0024】
図4において、前加工精度によっては、ワークが1回転する間にたとえば仮想線で示すように上下の振れが生じるが、前記O値調整された基準値に対する最大値d1,d2をそれぞれ制御盤35内の制御装置に入力し、その入力値d1,d2を基に、該ワークWに対するアプローチ量が最も短くなるように砥石の待機位置を設定する。すなわち、測定したワークの上下被研削面の最大値d1、d2から、それぞれ必要最小限のアプローチ量(たとえば数百μm)を確保するように砥石の待機位置を設定する。
【0025】
[研削作業]
(1)図5において、前記のように前加工状態の寸法を基にワーク毎に導き出された待機位置P0まで、上下の砥石2,3を上方及び下方に退け、待機させる。
【0026】
(2)図1の回転テーブル6の回転により、着脱位置A1のワークWを研削位置A2に移動し、ワーク保持治具10を自転させることによりワークWを自転軸芯O2回りに回転させる。
【0027】
(3) 図5において、上側砥石2を待機位置P0から高速の送り速度で下降させると同時に同速度で下側砥石3を上昇させ、それぞれ研削開始位置P1まで所定のアプローチ量だけ送り込み、その後、低速の研削速度に上下の砥石2,3の下降及び上昇速度を切り換え、研削終端位置まで所定の取り代を研削する。
【0028】
【発明のその他の実施の形態】
(1)上記高速の送り速度によるアプローチ後の研削行程は、材料に応じて各種考えられ、たとえば粗研削速度から仕上げ研削速度へと、順次減速するように研削することも可能である。
【0029】
(2)ワークを着脱位置から研削位置に位置変更するための移動テーブルとしては、回転テーブルの他にリニア式の移動テーブルを利用することも可能である。
【0030】
【発明の効果】
以上説明したように本願発明によると、(1)研削作業時において、砥石がワークに接触するまでのアプローチ時間を、ワーク毎に短縮することができ、研削作業能率が向上する。
【0031】
(3)ワーク着脱位置で各ワークの上下被研削面を測定するので、測定器を配置するスペースが簡単に確保でき、また、研削作業位置から離れた個所で測定するので、研削作業中において、次のワークを精度良く測定することができ、これによっても作業能率が向上する。
【0032】
(4)ワークの前加工時に精度のばらつきがあっても、各ワーク毎に簡単に研削開始位置を検知でき、研削精度が向上する。
【図面の簡単な説明】
【図1】本願発明にかかる研削方法を適用する竪型両頭平面研削盤の側面図である。
【図2】寸法測定器の拡大側面図である。
【図3】0値調整作業を示す寸法測定器の側面図である。
【図4】ワークの寸法測定作業を示す側面略図である。
【図5】研削作業の一例を示す側面図である。
【符号の説明】
2 上側の砥石
3 下側の砥石
4 上側の砥石軸
5 下側の砥石軸
6 回転テーブル
10 ワーク保持治具
12 クランプ装置
13 前加工寸法測定器
35 制御盤
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grinding method for a vertical double-sided surface grinding machine for simultaneously grinding upper and lower surfaces to be ground of a work held by a work holding jig with a pair of upper and lower grindstones movable vertically.
[0002]
[Prior art]
As an example of quantitative grinding in a vertical double-ended surface grinder, the present applicant has developed a method of measuring a current value of a grinding wheel rotating motor and setting a grinding start position of the grinding wheel based on a change in the current value. That is, the whetstone is brought close to the work while measuring the current value of the motor for rotating the whetstone, and after the contact with the work, when the increment of the current value reaches the set value, the position is stored in the controller or the like as the grinding start position, and the whetstone is stored. Is once retracted to the standby position. After the upper and lower whetstones both detect the grinding start position and retreat, the two whetstones are fed again at a high speed until immediately before the above-mentioned grinding start position, then reduced to the grinding speed, and a predetermined allowance grinding is performed from the grinding start position. .
[0003]
[Problems to be solved by the invention]
When grinding the upper and lower surfaces to be ground of the work by the above-described grinding method, the grinding start position is detected without grasping the pre-processing accuracy of the work, that is, the run-out, thickness and height before grinding. Therefore, the standby position (retreat position) of the grindstone must be set to a position far away from the work in consideration of various irregularities of the work, etc., so that the feed amount (approach amount) of the grindstone becomes uselessly long. , Causing a reduction in work efficiency.
[0004]
[Object of the invention]
According to the present invention, even if there is a large variation in the pre-processing accuracy, by measuring the work before grinding, according to the pre-processing accuracy of each work, the grindstone can be efficiently fed, and the vertical double-ended flat surface can be ground. An object of the present invention is to provide a grinding method for a grinding machine.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present application is provided with a pair of rotating grindstones that are vertically opposed and movable vertically, and a moving table for moving a work having a work holding jig. It is possible to change the position to the work attachment / detachment position, and at the grinding position, move both whetstones from the standby position vertically separated from the upper and lower grinding surfaces of the work respectively to the grinding end position, thereby simultaneously grinding the upper and lower grinding surfaces of the work. In a vertical double-sided surface grinding machine that performs surface grinding,
With a pre-processing measuring instrument arranged near the work attachment / detachment position, the vertical position of the upper and lower ground surfaces of the work before grinding is measured, and the standby position of the grindstone is set based on the measured values,
Move the work to the grinding position, move the grindstone from the standby position set above to the grinding start position that contacts the work or the position just before the contact at a high feed rate,
Thereafter, a grinding method in a vertical double-ended surface grinding machine characterized by grinding at a grinding speed lower than the above-mentioned feed speed.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side view of a vertical double-sided surface grinder to which the present invention is applied. A pair of vertically opposed annular grinding wheels 2 and 3 are housed in a main body case 1. Numeral 3 is fixed to the upper and lower grinding wheel shafts 4 and 5 arranged on the same vertical axis O3. The two grinding wheel shafts 4 and 5 are each configured to be vertically movable by an elevating mechanism, and are connected to a power transmission mechanism so as to rotate in mutually opposite directions.
[0007]
The rotary table 6 for moving the work is fixed to an upper end of a vertical table drive shaft 7, and the table drive shaft 7 is supported by a cylindrical support case 8 via a bearing so as to be rotatable around a table rotation axis O1. It is linked to a drive motor via a transmission mechanism (not shown).
[0008]
The rotary table 6 is provided with a pair of work holding jigs 10 and a clamp device 12 for fixing the work W on each work holding jig 10 from above. A pre-processing dimension measuring device 13 for measuring dimensions is arranged.
[0009]
The two work holding jigs 10 are arranged around the table axis O1 with a phase difference of 180 °, and are supported by a cylindrical jig support case 15 so as to be rotatable about the rotation axis O2. When the wheel 6 rotates a half turn, the position can be changed between a grinding position A2 on the grindstone side and a detachable position A1 on the opposite side.
[0010]
The clamp device 12 includes a pair of cylinders 22 having clamp rods 21 which can be extended downward, and a pressing unit 23 attached to the lower end of each clamp rod 21. Each cylinder 22 is arranged on the same axis as the rotation axis O2 of the work holding jig 10 and is fixed to a bracket 24 fixed to the upper surface of the turntable 6. It rotates around the table rotation axis O1 together with the jig 10.
[0011]
FIG. 2 is an enlarged side view of the work holding jig 10 and the measuring device 13 at the attachment / detachment position A1. The work W shown in a vertical cross section has an inner disk portion 26 and an outer flange portion 27 integrally formed with the inner disk portion 26 via a cylindrical portion, and upper and lower end surfaces of the outer flange portion 27 are Surface grinding is performed at the same time as the surface to be ground.
[0012]
The pressing unit 23 of the clamp device 12 is provided with a rotatable steel ball 25 at the lower end, presses the periphery of the center hole of the work W with the steel ball 25, and rotates the holding jig 10 and the rotation axis of the work W. A rotation around O2 is allowed.
[0013]
The dimension measuring device 13 is a differential transformer-type electric micrometer which is disposed near the work attaching / detaching position A1 of the rotary table 6 and has a pair of upper and lower lever-shaped measuring elements 30. The arm 31 of each measuring element 30 is supported by each measuring head 32 so as to be rotatable in the vertical direction, the upper arm 31 is urged downward by urging means such as a leaf spring, and the lower arm 31 is It is urged upward by urging means such as a leaf spring. A differential transformer for each tracing stylus is built in the measuring instrument main body 33 or the measuring head 32, and converts the vertical displacement of each tracing stylus 30 into an electric quantity such as a current, and the like via an amplifier or the like. The display is displayed on the display surface of the control panel 35 in a digital or pointer manner. In each measuring head 32, there is provided a retractor mechanism (a cylinder device or the like) capable of forcibly expanding each measuring element 30 upward and downward against the urging means.
[0014]
The upper and lower measuring heads 32 are supported by the measuring device main body 33 so as to be vertically slidable, and the upper and lower measuring element adjusting screws 37 and 38 are used to adjust the vertical position of each measuring head 32 respectively. It can be adjusted.
[0015]
The measuring device main body 33 is mounted on a front-rear slider 39, which is supported by a pair of upper and lower horizontal rails 41 provided on a vertical support plate 40 so as to be movable in the front-rear direction. The hydraulic cylinder 42 is connected to a rod 42 and is moved back and forth by expansion and contraction of the hydraulic cylinder 42.
[0016]
[Grinding method]
First, as shown in FIG. 3, using a master gauge MG serving as a reference for the size (thickness) of the workpiece to be ground, zero value adjustment of the pre-processing dimension measuring device 13 is performed. The workpiece size before grinding is measured at the attachment / detachment position A1 as shown in FIG. 4, and based on the measured value, grinding is performed at a predetermined allowance at the grinding position A2 as shown in FIG. Hereinafter, each step will be described in detail.
[0017]
[0 adjustment of measuring instrument]
(1) In FIG. 3, a master gauge MG serving as a reference for the size (thickness) of a workpiece to be ground is placed on the upper surface of the workpiece holding jig 10, and the pressing unit 23 of the clamp device 12 presses the periphery of the central hole of the master gauge MG. Is pressed from above to position and fix the master gauge MG at a predetermined position.
[0018]
(2) With the upper and lower tracing styluses 30 expanded up and down by the retract mechanism, the measuring instrument main body 33 is advanced by the front and rear hydraulic cylinders 42 and the retract mechanism is released at the advanced position as shown by the imaginary line, whereby the upper and lower parts are released. The distance between the measuring elements 30 is reduced, and the measuring elements 30 are brought into contact with the upper and lower end surfaces of the outer peripheral flange portion 27 of the master gauge MG.
[0019]
(3) The measured current value is displayed on the display surface (monitor) of the control panel 35. First, the upper measuring head 32 is slid vertically by the upper measuring element adjusting screw 37, and the upper surface position display value becomes "0". Then, the lower measuring head 32 is slid up and down by the lower tracing stylus adjusting screw 38 so that the display value of the lower surface position becomes “0”.
[0020]
(4) Repeat the upper and lower retraction of the measurement arm unit 31 and confirm that the displayed value does not change significantly. After confirmation, the tracing stylus 30 is retracted with the retractor extended vertically, the clamp by the clamp device 12 is released, and the master gauge MG is removed from the work holding jig 10.
[0021]
[Measurement of workpiece in pre-processed state]
(1) In FIG. 2, a work W that has not been ground (pre-processed state) is placed on the work holding jig 10 at the work attaching / detaching position A1 by a loading device (not shown), and the work W is pressed by the pressing unit 23 of the clamp device 12. The peripheral edge of the central hole is pressed to fix the position.
[0022]
(2) After positioning and fixing the work W to the work holding jig 10 as described above, the measuring device 13 measures the vertical position of the upper and lower end surfaces of the flange portion 27 while slowly rotating the work W.
[0023]
That is, the measuring instrument main body 33 is moved forward in a state where the tracing stylus 30 is opened in the vertical direction, and the lower tracing stylus 30 is raised simultaneously with the lower tracing stylus 30 with respect to the slowly rotating work W, The vertical position of the upper and lower ground surfaces of the unground work W is measured.
[0024]
In FIG. 4, depending on the accuracy of the pre-machining, a vertical run-out occurs as shown by, for example, a virtual line during one rotation of the work. The standby position of the grindstone is set based on the input values d1 and d2 so that the approach amount to the work W is the shortest. That is, the standby position of the grindstone is set so as to secure the required minimum approach amount (for example, several hundred μm) from the measured maximum values d1 and d2 of the upper and lower ground surfaces of the work.
[0025]
[Grinding work]
(1) In FIG. 5, the upper and lower grindstones 2 and 3 are retreated upward and downward until the standby position P0 derived for each work based on the dimensions in the pre-machining state as described above, and are made to stand by.
[0026]
(2) The work W at the attachment / detachment position A1 is moved to the grinding position A2 by the rotation of the rotary table 6 in FIG. 1, and the work W is rotated around the rotation axis O2 by rotating the work holding jig 10.
[0027]
(3) In FIG. 5, the upper grindstone 2 is lowered at a high feed speed from the standby position P0, and simultaneously the lower grindstone 3 is raised at the same speed, and each is fed to the grinding start position P1 by a predetermined approach amount. The lowering and raising speeds of the upper and lower grinding wheels 2 and 3 are switched to a low grinding speed, and a predetermined allowance is ground to the grinding end position.
[0028]
Other Embodiments of the Invention
(1) The grinding process after the approach at the high feed rate can be considered variously depending on the material. For example, it is also possible to perform the grinding so as to sequentially reduce the speed from the rough grinding speed to the finish grinding speed.
[0029]
(2) As a moving table for changing the position of the workpiece from the attaching / detaching position to the grinding position, it is also possible to use a linear moving table in addition to the rotary table.
[0030]
【The invention's effect】
As described above, according to the present invention, (1) during the grinding operation, the approach time until the grinding wheel comes into contact with the work can be reduced for each work, and the efficiency of the grinding operation is improved.
[0031]
(3) Since the upper and lower surfaces to be ground of each work are measured at the work attachment / detachment position, a space for arranging the measuring device can be easily secured. Also, since the measurement is performed at a place apart from the grinding work position, during the grinding work, The next work can be measured with high accuracy, which also improves work efficiency.
[0032]
(4) Even if there is a variation in accuracy during pre-working of the work, the grinding start position can be easily detected for each work, and the grinding accuracy is improved.
[Brief description of the drawings]
FIG. 1 is a side view of a vertical double-sided surface grinding machine to which a grinding method according to the present invention is applied.
FIG. 2 is an enlarged side view of the dimension measuring device.
FIG. 3 is a side view of the dimension measuring device showing a zero value adjustment operation.
FIG. 4 is a schematic side view showing a work for measuring a dimension of a work.
FIG. 5 is a side view showing an example of a grinding operation.
[Explanation of symbols]
2 Upper grindstone 3 Lower grindstone 4 Upper grindstone shaft 5 Lower grindstone shaft 6 Rotary table 10 Work holding jig 12 Clamp device 13 Pre-processing dimension measuring instrument 35 Control panel

Claims (1)

上下に対向すると共に上下方向移動可能な1対の回転砥石と、ワーク保持治具を有するワーク移動用の移動テーブルとを備え、移動テーブルによりワークを研削位置とワーク着脱位置とに位置変更可能とし、研削位置において、両砥石をワークの上下被研削面からそれぞれ上下に離れた待機位置から、研削終端位置まで移動することにより、ワークの上下被研削面を同時に平面研削する竪型両頭平面研削盤において、
ワーク着脱位置の近傍に配置された前加工測定器により、研削前のワークの上下被研削面の上下方向位置を測定すると共に、上記測定値に基づいて砥石の待機位置を設定し、
ワークを研削位置に移動し、砥石を上記設定された待機位置からワークに接触する研削開始位置または接触手前の位置まで高速の送り速度で移動し、
その後、上記送り速度より低速の研削速度で研削することを特徴とする竪型両頭平面研削盤における研削方法。
A pair of rotating grindstones that are vertically opposed and movable in the vertical direction, and a moving table for moving the work having a work holding jig are provided. The movable table can change the position of the work between the grinding position and the work attaching / detaching position. A vertical double-sided surface grinder that simultaneously grinds the upper and lower grinding surfaces of the work by moving both whetstones from the standby position vertically separated from the upper and lower grinding surfaces of the work to the grinding end position at the grinding position. At
With the pre-processing measuring instrument arranged near the work attachment / detachment position, measure the vertical position of the upper and lower ground surfaces of the work before grinding, and set the standby position of the grindstone based on the measured values,
Move the work to the grinding position, move the grindstone at a high feed rate from the set standby position to the grinding start position to contact the work or the position just before the contact,
Thereafter, a grinding method in a vertical double-sided surface grinding machine, characterized by grinding at a grinding speed lower than the feed speed.
JP2002235684A 2002-08-13 2002-08-13 Grinding method for vertical double-sided surface grinder Expired - Fee Related JP3806680B2 (en)

Priority Applications (2)

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JP2002235684A JP3806680B2 (en) 2002-08-13 2002-08-13 Grinding method for vertical double-sided surface grinder
US11/072,970 US7004816B2 (en) 2002-08-13 2005-03-07 Grinding method for vertical type of double disk surface grinding machine

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